<template>
<div class="todo-footer">
          <label>
            <input type="checkbox" v-model="isSelAll"/>
          </label>
          <span>
            <span>已完成{{ selCount }}</span> / 全部{{ todos.length }}
          </span>
          <button class="btn btn-danger" @click="deleteSelTodo">清除已完成任务</button>
        </div>
</template>

<script setup lang="ts">
import { TodosModel } from '@/App.vue';
import { computed } from 'vue';

interface PropsModel {
  checkAll: (bool:boolean) => void
  todos: TodosModel,
  deleteSelTodo: () => void
}

const props = defineProps<PropsModel>()

//全选
const isSelAll = computed({
  get() {
    return props.todos.every(todo => todo.isSel) && !!props.todos.length
  },
  set(val) {
    // console.log('全选选择', val);
    props.checkAll(val)
  },

  
})

//选中个数
const selCount = computed(() => {
  return props.todos.reduce((prev,todo) => {
    return prev + Number(todo.isSel)
  },0)
})

</script>

<style scoped>
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>